A small drone flies into a damaged Fukushima reactor for the first time to study its melted fuel

A small drone has flown inside one of the damaged reactors at the wrecked Fukushima Daiichi nuclear power plant in hopes it can examine some of the molten fuel debris in areas where earlier robots failed to reach. Tokyo Electric Power Company Holdings also began releasing the fourth batch of the plant’s treated and diluted radioactive wastewater into the sea Wednesday. A magnitude 9.0 quake and tsunami in March 2011 destroyed the plant’s power supply and cooling systems, causing triple meltdowns. The government and the plant operator plan to remove all melted fuel debris — a daunting task expected to last decades if achieved.